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One of the most puzzling questions in biology is how multi-cellularity arose. Explain the conditions under which having a body with more than one cell would have been adaptive. What kinds of problems do having larger and/or more cells present to an organism? What are some strategies used by these organisms to deal with these problems? Finally, a number of eukaryote groups are represented by colonial and multicellular members. Using your knowledge of these two categories, what criteria would you use to distinguish between an organism that is colonial and one that is "truly" multicellular?
Assume you are given a test tube containing ten mL of a solution with 6.7 times 109 cells/mL. You are to produce a solution that contains less than 100 cells/mL - but not exactly 100.
Determine what of the following describes the immediate spatial relationship of the left kidney to other structers on posterior abdominal?
It is a great day at the lab. You have identified an E. coli F- strain that cannot grow without biotin (bio-). Unfortunately, the next day a rivaling postdoc "accidently" mixed your strain with another strain ‘X' that cannot grow without arginine ..
In the absence of an inducer molecule, will lac repressor proteins (encoded by the lacI gene) be bound to the lac operon? If so, where will they bind?
Mark all key innovation of Spermatophyta over their ancestors (synapomophy).
At room temperature, equilibrium potential of K+ in a cell with internal concentration of K+ 10 fold higher than that of external concentration will be approximately.
You have inhaled a spore from the common fungus Aspergillus fumigatus. Describe the pathways of antigen processing and presentation that would take place. Make sure to explain the detailed pathway.
Today we learned about how the electrical signals are carried throughout your heart to create synchronous but separate contraction of the atria and ventricles.
The MN blood group is determined through a single gene with two alleles M and N. A Navajo population in New Mexico was tested for this blood group.
With these anatomical features in mind, do some research in order to determine an angiosperm which has modified leaves, stems, roots or flowers that do not function in the normal manner, or that function in an unusual manner.
The wider orrcurence of glycolysis in nearly all organisms, both aerboic and anaerobic, indicates that it is one of the most ancient metabolic pathways.
The chance that a baby will be a girl is 1/2 and the chance of having a boy is also 1/2. If a certain family has three boys, what is the chance that their next child will be a girl? Explain your answer.
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